package my.mark.mybaibaoxiang.platformBase.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * 获取请求源的IP地址。
 * @Description: IP Util
 * @Author wxming
 * @Date 2019年9月18日 下午10:44:34
 */
public class IpUtil {

    public static String requestIp(HttpServletRequest request) {
        String ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                //根据网卡取本机配置的IP  
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
        if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15  
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }

    public static long ip2long(String ip) {
        String[] tmps = ip.split("\\.");
        long tmp = 0;
        for (int i = 0; i < tmps.length; i++) {
            tmp += Long.parseLong(tmps[i]) << (32 - (i + 1) * 8);
        }
        return tmp;
    }

    public static String long2Ip(long n) {
        StringBuffer sb = new StringBuffer("");
        sb.append(n >>> 24);
        sb.append(".");
        sb.append((n & 0x00FFFFFF) >>> 16);
        sb.append(".");
        sb.append((n & 0x0000FFFF) >>> 8);
        sb.append(".");
        sb.append(n & 0x000000FF);
        return sb.toString();
    }
}
